Clement, Charles R, William Denevan, Michael Heckenberger, Andre Braga Junqueira, Eduardo Neves, Wenceslau Teixeira, and William Woods. 2015. “Agro-Ecology: Much of the Amazon Rain Forest Was Once Farmland”. World Nutrition 6 (9-10): 694-703. https://worldnutritionjournal.org/wn/article/view/69.